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Thread: Polyquat and closing

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    Polyquat and closing

    Choosing polyquat on closing... Or not?

    And if so, how to close with polyquat AND shock level FC for those of us with solid covers and freezing winters. Especially for with those of us with borates >50. Any new thoughts?

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    JasonLion's Avatar
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    Re: Polyquat and closing

    Polyquat will use up some chlorine, but not huge amounts. If you are concerned with keeping FC as high as possible you need to allow 24 hours after the polyquat addition, then test the FC level and raise it up to where you want it. Doing this helps a little, but is only going to make a small difference overall (compared to adding polyquat and raising to shock level and close the pool without waiting.)
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Polyquat and closing

    So, let me see if I understand. Assuming good pool chemistry, no algae or CC, and wanting to have FC last as long as possible over a long winter; the plan is:

    Raise FC to shock level, add polyquat, wait 24 hours, redose to shock level. Close.

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    JasonLion's Avatar
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    Re: Polyquat and closing

    Sure.

    However, that isn't what I recommend doing. What you described doing is better at preventing algae than what I recommend, but not enough better to be worth the extra effort (in my opinion). I shock a day or two in advance, then add polyquat right before closing (just enough time before closing to mix it into the water), and don't bother with bringing it back up to shock level a second time. The chlorine won't last all that long regardless. They key thing is to make sure there isn't any live algae (even minute/invisible quantities) when you close. Having a high FC level is part of that, but but being right at shock level at the moment you close isn't essential.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Polyquat and closing

    Very clear and understandable reply. Thanks, Jason. I was deliberating about even bothering with polyquat because of its impact on FC.

    Effort is my middle name. If it could impact my opening in the slightest...done!

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